Since the author doesn't read the reviews., I'ma help the players.
The silver key DOES do something. When you figure out what you'll know wich exit you should plank.
For further information, read Snufalufagus' comment (4 before me).
I'm the only one who didn't need the solution for the potion ? (sorry bad english)
how do u heat up the potion
Loved it. Wish there were more possible choices and endings, but it's still good.
That was an awesome game!